Setting Up Price Alerts with the Streaming API

Price alerts allow you to monitor markets without constantly watching charts. Using the WebSocket streaming API, you can build a custom alert system that notifies you when prices reach key levels.

System Architecture

WebSocket Stream → Price Monitor → Alert Checker → Notification Service
                                                          ↓
                                               Email / SMS / Push

Basic Alert Implementation

class PriceAlertMonitor {
    constructor(apiKey) {
        this.ws = new WebSocket(`wss://api.pulse-markets.com?api_key=${apiKey}`);
        this.alerts = [];
    }

    addAlert(symbol, condition, price, callback) {
        this.alerts.push({ symbol, condition, price, callback, triggered: false });
    }

    checkAlerts(quote) {
        this.alerts.forEach(alert => {
            if (alert.triggered || alert.symbol !== quote.symbol) return;

            const triggered = alert.condition === 'above'
                ? quote.price >= alert.price
                : quote.price <= alert.price;

            if (triggered) {
                alert.triggered = true;
                alert.callback(quote);
            }
        });
    }
}

Notification Options

Email Notifications

Use services like SendGrid or AWS SES to send email alerts when prices trigger.

Push Notifications

Integrate with services like Pushover or Firebase Cloud Messaging for mobile alerts.

Telegram Bot

Create a Telegram bot for instant messaging alerts—popular among traders for its reliability.

Best Practices

• Implement cooldown periods to prevent alert spam
• Log all alerts for review
• Include relevant context in notifications (current price, time, etc.)
• Test thoroughly before relying on alerts for trading decisions